Hello,
I'm having the same problem, and the link you provided is not helpful. Under "Set up two-step verification", it says:
"1. Go to Sign in to your QuickBooks Online account.
2. In the Two-step verification section, select Turn on."
But it doesn't tell you where to go (i.e., under which menu) to find two-step verification.
A screenshot would be helpful. This is a consistent problem with QBO. The advice often tells you how to do something without a screenshot. I suspect the UI has been changed since a lot of the FAQ was written, and it's outdated.
